4  *  JZ4740 platform PWM support
20 #include <linux/pwm.h>
39 	/* Enable all TCU channels for PWM use by default except channels 0/1 */  in jz4740_pwm_can_use_chn()
43 				 "ingenic,pwm-channels-mask",  in jz4740_pwm_can_use_chn()
49 static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_request()  argument
56 	if (!jz4740_pwm_can_use_chn(chip, pwm->hwpwm))  in jz4740_pwm_request()
59 	snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);  in jz4740_pwm_request()
74 	jz->clk[pwm->hwpwm] = clk;  in jz4740_pwm_request()
79 static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_free()  argument
82 	struct clk *clk = jz->clk[pwm->hwpwm];  in jz4740_pwm_free()
88 static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_enable()  argument
92 	/* Enable PWM output */  in jz4740_pwm_enable()
93 	regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm), TCU_TCSR_PWM_EN);  in jz4740_pwm_enable()
96 	regmap_write(jz->map, TCU_REG_TESR, BIT(pwm->hwpwm));  in jz4740_pwm_enable()
101 static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in jz4740_pwm_disable()  argument
109 	regmap_write(jz->map, TCU_REG_TDHRc(pwm->hwpwm), 0xffff);  in jz4740_pwm_disable()
110 	regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), 0x0);  in jz4740_pwm_disable()
113 	 * Disable PWM output.  in jz4740_pwm_disable()
117 	regmap_clear_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm), TCU_TCSR_PWM_EN);  in jz4740_pwm_disable()
120 	regmap_write(jz->map, TCU_REG_TECR, BIT(pwm->hwpwm));  in jz4740_pwm_disable()
123 static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in jz4740_pwm_apply()  argument
128 	struct clk *clk = jz->clk[pwm->hwpwm];  in jz4740_pwm_apply()
169 	jz4740_pwm_disable(chip, pwm);  in jz4740_pwm_apply()
178 	regmap_write(jz->map, TCU_REG_TCNTc(pwm->hwpwm), 0);  in jz4740_pwm_apply()
181 	regmap_write(jz->map, TCU_REG_TDHRc(pwm->hwpwm), duty);  in jz4740_pwm_apply()
184 	regmap_write(jz->map, TCU_REG_TDFRc(pwm->hwpwm), period);  in jz4740_pwm_apply()
187 	regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
193 	 * The PWM starts in inactive state until the internal timer reaches the  in jz4740_pwm_apply()
196 	 * value, as a high duty value would otherwise result in the PWM pin  in jz4740_pwm_apply()
199 	 * Here, we don't do that, and instead invert the polarity of the PWM  in jz4740_pwm_apply()
200 	 * when it is active. This trick makes the PWM start with its active  in jz4740_pwm_apply()
204 		regmap_clear_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
207 		regmap_set_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),  in jz4740_pwm_apply()
211 		jz4740_pwm_enable(chip, pwm);  in jz4740_pwm_apply()
262 	{ .compatible = "ingenic,jz4740-pwm", .data = &jz4740_soc_info },
263 	{ .compatible = "ingenic,jz4725b-pwm", .data = &jz4725b_soc_info },
264 	{ .compatible = "ingenic,x1000-pwm", .data = &x1000_soc_info },
271 		.name = "jz4740-pwm",
279 MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
280 MODULE_ALIAS("platform:jz4740-pwm");